Electro-fermentation regulates mixed culture chain elongation with fresh and acclimated cathode

Jiang, Yong; Chu, Na; Zhang, Wei; Zhang, Lixia; Zeng, Raymond J.

doi:10.1016/j.enconman.2019.112285

Cited by 52 publications

(20 citation statements)

References 57 publications

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“…However, acetate was rapidly consumed after reaching its maximum concentration and not enough corresponding butyrate or caproate were produced in all reactor, as well as trace butyrate and caproate were consumed than accumulated. This phenomenon was also reported by Jiang et al [7], and they observed an increase in OD 600 of catholyte. Thus, they attributed this phenomenon to the growth of heterotrophic and planktonic microbes using the organic acids produced.…”

Section: Effect Of Voltage On Mcfas Production In the Absence Of Nzvisupporting

confidence: 86%

“…Therefore, a higher hydrogen percentage was detected in the headspace of the R4 as shown in Fig. S2b (Additional le 1), and Jiang et al [7] suggested that a higher hydrogen partial pressure (0.1 bar) has an enriching effect on chain-elongating microbes and also relieved the oxidation of medium chain carboxylates.…”

Section: Nzvi Promotion Mechanisms Of Functional Microbial Electron T...mentioning

confidence: 94%

“…For ease of interpretation, the following samples were abbreviated as M1 to M7: inoculum (M1), 1.2 V catholyte and bio lm microorganisms (M2 and M3, the parallel reactor of R1 was destroyed), 0 V + 5 g/L NZVI (i.e., R2) catholyte and bio lm microorganisms (M4 and M5), and 1.2 V + 5 g/L NZVI (i.e., R4) catholyte and bio lm organisms (M6 and M7). The details of cell collection were performed according to Jiang et al [7]. The bacterial community was analyzed through the 16S rRNA gene high throughput sequencing using the Miseq Illumina platform.…”

Section: Microbial Community Analysismentioning

confidence: 99%

“…Recently, a continuous route for the production of MCFAs from CO 2 has been proved feasible in MES, where CO 2 is rst reduced to acetate catalyzed by the homoacetogenic bacteria and then to MCFAs through chain elongation fermentation [6]. Of all MCFAs, the caproate is receiving increasing attention because it has by far the lowest production capacity from traditional resources such as palm and kernel oil [7].…”

Section: Introductionmentioning

confidence: 99%

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Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Zhang

et al. 2022

Preprint

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Background: Microbial electrosynthesis (MES) has been considered a promising platform for carboxylic acids production using homoacetogenic and chain-elongating bacteria. However, this biotechnology is still in its infancy, and many limitations are needed to be transcended, such as low electron transfer efficiency between cathode and microbes.Results: In this study, nano zero-valent iron (NZVI) was employed to improve carboxylic acid production in the MES system. The final accumulated acetate, butyrate, and caproate concentration enhanced from 700.1, 53.6, and 11.8 mg/L to 1.6, 1.1, and 0.7 g/L, with the maximum yield on bicarbonate of 20.7%, 18.7%, and 13.7%, respectively. Besides performing as an additional electron donor, NZVI was also proven to facilitate the formation of electroactive biofilms according to the results of DNA concentration. In addition, it was found that the anaerobic corrosion of NZVI promoted the domination of hydrogen-producing bacteria Paraclostridium, with the increasing relative abundance from 16.78% to 44.18% in the biofilm under open-circuit mode. While under the closed-circuit, the presence of NZVI resulted in significantly higher relative abundances of homoacetogenic bacteria (Terrisporobacter: 20.91%) and chain-elongating bacteria (Clostridium-sensu-stricto-12: 11.8%) in biofilm than in the catholyte (2.18% and 1.63% correspondingly).Conclusions: This study provided the evidence and revealed how NZVI assisted carboxylic acid production in MES and contributes to the application prospects of MES for carbon utilization and energy sustainability.

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Section: Effect Of Voltage On Mcfas Production In the Absence Of Nzvisupporting

confidence: 86%

Section: Nzvi Promotion Mechanisms Of Functional Microbial Electron T...mentioning

confidence: 94%

Section: Microbial Community Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Zhang

et al. 2022

Preprint

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“…The influence of potential on the complex microbial community was mostly non‐linear, with the exception that Escherichia fergusonii abundance increased at low applied potential. Subsequent studies revealed that EF can improve H 2 production from food waste with complex microbial communities, [57] can select against methanogenesis in mixed hydrogen fermentations, [58] and can shape the microbial community to increase production of caproic acid [59] …”

Section: Combining Electrochemical Systems With Living Cellsmentioning

confidence: 99%

Enhancing Biosynthesis and Manipulating Flux in Whole Cells with Abiotic Catalysis

Stewart

Domaille

2020

ChemBioChem

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Metabolic engineering uses genetic strategies to drive flux through desired pathways. Recent work with electrochemical, photochemical, and chemocatalytic setups has revealed that these systems can also expand metabolic pathways and manipulate flux in whole cells. Electrochemical systems add or remove electrons from metabolic pathways to direct flux to more‐ or less‐reduced products. Photochemical systems act as synthetic light‐harvesting complexes and yield artificial photosynthetic organisms. Biocompatible chemocatalysis increases product scope, streamlines syntheses, and yields single‐flask processes to deliver products that would be challenging to synthesize through biosynthetic means alone. Here, we exclusively highlight systems that combine abiotic systems with living whole cells, taking particular note of strategies that enable the merger of these typically disparate systems.

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An Overview of Electro‐Fermentation as a Platform for Future Biorefineries

Chung

Dhar

2021

Sustainable Solutions for Environmental Pollution

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Electro-fermentation regulates mixed culture chain elongation with fresh and acclimated cathode

Cited by 52 publications

References 57 publications

Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Enhancing Biosynthesis and Manipulating Flux in Whole Cells with Abiotic Catalysis

An Overview of Electro‐Fermentation as a Platform for Future Biorefineries

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